Biology · Oct / Nov 2024 · Paper 41 · Question 4

first gap: central and second gap: peripheral ;

T

P

S

Q

N

M

R

;;

any two from:

touch ;

temperature ;

AVP ;

circular / radial, muscle ;

total of five from:

1

only the first neurone releases neurotransmitters ;

2

only the second neurone has (complementary) receptors ;

max four from:

3

ref. to neurotransmitter (molecules) ;

4

(neurotransmitter is released) from vesicles ;

5

into the synaptic gap ;

6

the junction between the neurones is the synapse ;

7

(neurotransmitter molecules) diffuse (across the gap) ;

8

ref. to receptors are complementary in shape (to neurotransmitter) ; 9

(neurotransmitter molecules) bind with receptors (on the next neurone) ; 10 impulse is then stimulated (in the next neurone) ;